how to insert a time delay?

Question

Tahir 2012-5-1

0
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https://ww2.mathworks.cn/matlabcentral/answers/37088-how-to-insert-a-time-delay

As a short I have a following question ; -In my thesis I use X Plane(aircraft simulation program) and Simulink. I get aircraft values during the flight like pitch degree directly from X plane through UDP connection to Simulink. Here is everything fine. The problem is I want to insert a time delay for to calculate another parameter like pitch rate (which is pitch_degree(t) - pitch_degree(t-1), current (at time t) pitch degree minus before( t-1)pitch degree). Question is how can I do this? In simulink there is discrete blocks like Unit Delay Block or continous blocks like Variable Time Delay. I try both of them but it seems not functioning. Is there any one who have any idea how to solve this problem

Many thanks from now Tahir